Thomas hollidat



THOMAS HOLLIDAY, OF HUDDERSFIELD, COUNTY OF YORK, ENGLAND.

PROCESS OF NAPHTHOL DYElNG.

SPECIFICATION forming part of Letters Patent No. 355,933, dated January11, 1887.

Application filed October 23, 1885.

T 0 all whom it may concern:

Be it known that I, THOMAS HOLLIDAY, of Huddersfield, in the county ofYork, in the United Kingdom of Great Britain and Ireland, a subject ofthe Queen of Great Britain, have invented a certain new and usefulImprovement in the Treatment of Cotton or other Vegetable Fibers; and Idohereby declare that the following is a full, clear, and.

exact description of the invention, which will enable others skilled inthe art to which it appertains to make and use the same.

This invention consists in forming on cotton or other vegetable fibers adeposit of oxide of lead or a lead soap, and combining therewith alphaor beta naphthol for the purpose of forming azo coloring-matter thereon,and is carried'into effect by treating the cotton, 8m, with a solutionof oxide of lead in caustic alkali, and, when a soap is required,passing the cotton, &c., through a solution of soluble soap or an oilyemulsion, and treating the cotton, 850,011 which a depositof oxide oflead or lead soap has been formed with naphthol in solution orsuspension.

A good method of carrying this invention into 'efiect is to impregnateor steep cotton or other vegetable fiber-say one hundred poundsin asolution, hot or cold, composed of about ten pounds of acetate of leaddissolved in two hundred gallons of water, to which has been addedcaustic soda enough to precipitate all the lead and to redissolve theprecipitate. After about half an hours steeping or impregnation thecotton can be washed, and a considerablequantity of oxide of lead isfixed on the fiber for the purpose of forming an insoluble lead soap.The cotton is then impregnated with or steeped in a soap solution of,say, five pounds of castile-soap in one hundred gallons of water, thenwashed off in water, the'lead soap being attached to the fiber. Theproportions can be Varied. Other salts of lead or oxide can be usedinstead of acetate, and other alkalies-say, potash instead of soda.Othersoaps can be used instead of castile. For instance, Turkey-red oil,

sulphonated or not, and neutralized with ammonia, gives a good result;or an emulsion can be used, though I prefer a soap.

A modification of the process can be carried into effect by passing thefiber first through a solution of a salt of lead, then through a s0-Serial No. 180,747.

(No specimens.)

lution of caustic soda or potash, when oxide of lead will be formed anddeposited .on the fiber; or the soluble soap can be mixed with thecaustic alkali. The cotton, 850., having on it oxide of lead or leadsoap, can then be passed through or impregnated with asolution of, say,five pounds of alpha or beta naphthol in one hundred gallons of warmwater, and will then be ready for the formation of any azocoloring-matter having naphth'ol as a constituent, (preferably such asare insoluble or nearly insoluble in water;) or the color can be formedsimultaneously with the absorption of the naphthol, or in any otherknown manner.

The naphthol can be added to the bath of soluble soap and be drawn ontothe cotton at the time of the formation of the lead soap.

The oxide of lead may be combined with an acid in the process of formingthe colors or by treatment with an acid.

Cotton or other vegetable fiber can be treated either in a raw state,spun, woven, or otherwise manufactured.

Cotton or other vegetable fiber treated by this process can beidentified by the usual methods of chemical analysis.

The article produced by the within-described process will be made thesubject of a separate application for Letters Patent.

1. The method herein described of treating cotton or other fiber,consisting in impregnating the fiber with a lead soap and then with thenaphthols or coloring-matters formed with them, substantially as setforth.

2. The method herein described of treating cotton or other fiber,consisting in passing the fiber through a solution of a salt of lead towhich an alkali has been added and then through a soap solution, andfinally impregnating it with the naphthols or coloring-matters formedwith them, substantially as set forth.

In testimony whereof I, the said THOMAS HOLLIDAY, have hereunto set myhandthis 1st day of September, 1885.

THOMAS HOLLIDAY.

